Peshawar

A health worker vaccinates a child against polio, in Peshawar, Feb. 2, 2014.

Credit: Mohammad Sajjad/AP

Peshawar

Mohammad Wasil, kisses a photograph of his 19-year-old son, Hilal, a polio worker who was killed by militants, at his home in Peshawar, Jan. 28, 2014.

Credit: Mohammad Sajjad/AP

Peshawar

A Pakistani health worker administers a polio vaccine to a child during a polio immunization campaign in Peshawar, Feb. 2, 2014.

Credit: Hasham Ahmed/AFP/Getty Images

Peshawar

A Pakistani policeman, left, stands guard as a health worker vaccinates a child against polio, in Peshawar, Feb. 9, 2014.

Credit: Mohammad Sajjad/AP

Peshawar

A Pakistani health worker marks a sign on the door of a house to let others know that the home has been visited by health workers, who have given a polio vaccine to a child living there, in Peshawar, Feb. 2, 2014.

Peshawar

Peshawar

Samia Gul holds her 11-month-old daughter, Shaista, while doing her laundry at her home in Peshawar, Jan. 30, 2014. Shaista contracted the polio virus and was unable to stand, her legs buckling beneath her weight.

Her mother cries a lot and wonders what will become of her daughter, already at a disadvantage in Pakistan’s male-dominated society.